diff --git a/README.md b/README.md
index f05a301..8475a64 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # GeoIP2 PHP API #
 
+**NOTE**: This is an alpha release. The API may change before the final
+production release.
+
 ## Description ##
 
 Currently, this distribution provides an API for the GeoIP2 web services